In this article, We’ll see what’s the difference between substr and substring in javascript The substr() method extracts parts of a string, beginning at the character at the specified position, and returns the specified number of characters. The substring() method returns the part of the string between the start and end indexes, or to theRead more about Difference between the substr() and substring() in JavaScript?[…]

export default is used to export a single class, function or primitive. export default function() { } can be used when the function has no name. There can only be one default export in a file. Example: message.js We’ll see how to import this function in another file. In app.js Another Example: Myfunctions.js This canRead more about Export Default – Javascript[…]

In this article, We’ll see about map, filter and reduce function and discuss them one by one and understand their use cases. map: applies a function to all the items in an input list. filter: creates a list of elements for which a function returns true. reduce: is a performing some computation on a listRead more about Map, Filter and Reduce[…]

In this article, We’ll see how to remove a particular element from an array in javascript? let’s create a employee‘s array as follows: if we want to remove the value “Alex” from an employee’s array. what will do ? We can use filter method to remove the value “Alex” from an array. That’s it!. PleaseRead more about How to remove a particular element from an array in javascript?[…]

In this article, We’ll see how to remove a property from a javascript object? let’s create a employee object as follows: if we want to remove the property “address” from employee object. what will do ? We’ll use delete keyword to remove the property from object. That’s it!. Please share your thoughts or suggestions inRead more about How to remove a property from object in javascript?[…]

In this article, We’ll see how to remove a duplicate element from an array in javascript? In ES6, we’ll use new Set data structure to remove a duplicate elements from an array. Befor using the new Set data structure, we’ll read about its decription. Set objects are collections of values. You can iterate through theRead more about How to remove duplicate elements from an array in javascript?[…]

In this article, We’ll see how to check a string contains a substring in javascript? In ES6, we’ll use String.prototype.includes to find a substring in a string The includes() method determines whether one string may be found within another string, returning true or false as appropriate. Below an example using ES6 to find string containsRead more about How to check whether a string contains a substring in javascript ?[…]

Spread syntax is simply denoted as three … dots.it allows an array expression or string or anything which can be iterating to be expanded in places where zero or more arguments for function calls or elements for array are expected. Example: Without Spread syntax. Example: Using Spread syntax. Let us understand the spread syntax inRead more about Javascript spread syntax[…]

A callback function is a function passed into another function as an parameter, which is then invoked inside the outer function to complete some kind of action. For example, we’ll write a function to check “user is eligible for voting or not” and pass a callback function as a parameter. That’s it!. Please share yourRead more about Javascript callback function[…]

In this article, We’ll see how to check a key exist or not in json? before see the example, we’ll read about hasOwnProperty method and why we use hasOwnProperty method. hasOwnProperty() method returns a boolean indicating whether the object has the specified property as its own property (as opposed to inheriting it). To check theRead more about How to check a key exist or not in json object ?[…]